71928 CD/P4ADBA
71900 Series Super Precision Angular Contact Ball Bearings
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71928 CD/P4ADBA Bearing Product Overview & Core Advantages
The 71928 CD/P4ADBA is a precision angular contact ball bearing designed for applications demanding exceptional rotational accuracy and rigidity. As a duplex back-to-back (DB) matched set, it excels at handling combined loads, including significant radial loads and bidirectional axial loads. Manufactured to the stringent P4A tolerance class, this bearing offers superior running accuracy, making it ideal for high-speed, high-precision machinery. Its preloaded configuration ensures high rigidity and minimal axial play, providing stable performance under demanding operational conditions.
71928 CD/P4ADBA Bearing Model Code Explained, Specifications & Naming Convention
- 71928: Basic bearing series, indicating a light series angular contact bearing with 140mm bore, 190mm OD.
- C: Represents a 15° contact angle, optimized for high-speed applications with moderate axial load capacity.
- D: Indicates the bearing is part of a duplex pair.
- DB: Specifies the Duplex Back-to-Back arrangement, providing high moment rigidity.
- P4A: Denotes the super precision tolerance class, exceeding ABEC 7 standards for exceptional running accuracy.
- Open: The bearing is supplied without seals, allowing for customized lubrication systems.
- Extra Light Preload (Class A): Provides minimal internal clearance for high rigidity in precision applications.
71928 CD/P4ADBA Bearing Structural Features & Performance Benefits
High Rigidity & Precision: The duplex back-to-back arrangement creates a rigid bearing system that effectively resists moment loads and shaft deflection. Combined with the P4A tolerance class, this ensures exceptional running accuracy and positional stability.
Optimized Load Capacity: With a 15° contact angle and duplex configuration, this bearing efficiently handles combined radial and axial loads in both directions. The dynamic load rating of 34,425 lbf and static load rating of 52,200 lbf demonstrate its robust load-carrying capability.
High-Speed Performance: The phenolic cage and optimized internal geometry contribute to a limiting speed of 11,000 rpm, making it suitable for high-speed spindle applications.
Premium Materials: Constructed from chrome steel for both rings and balls, ensuring durability and long service life under demanding conditions.
71928 CD/P4ADBA Bearing Typical Application Areas
The 71928 CD/P4ADBA is specifically engineered for high-precision applications requiring superior accuracy and rigidity:
- Machine Tool Spindles: High-speed milling, grinding, and turning centers
- Precision Gearboxes: Industrial transmission systems requiring minimal deflection
- High-Frequency Motors: Spindle motors and high-speed drive systems
- Aerospace Components: Guidance systems and precision instrumentation
- Medical Equipment: High-speed dental handpieces and surgical tools
